INFULLENCE OF ADDING MCMBS INTO C/C COMPOSITES ON THEIR MICROSTRUCTURE AND MECHANICAL PROPERTIES AND DURING GRAPHITIZATION

摘要

Carbon/Carbon composites were prepared from oxidative PAN fiber felts, resol- type phenolic resin and MCMB derived from coal tar. In this study, the effect on microstructure, flexural strength, flexural moduli, electric conductivity and thermal conductivity of carbon/carbon composites with MBMC content ranging from 0 to 30 wt.% was examined during pyrolysis. Results showed carbon/carbon composite with addition of 10 ～30 wt.% MCMB having higher density, greater size (L_C), and higher preferred orientation than for carbon/carbon composites without MCMB during heat-treatment. These composites also exhibited an improvement in flexural strength from 19.7% to 30.3%. Flexural moduli of these composites added with MCMB is increased by 15.1% to 31.3% as compared to that of the zero wt.% MCMB added composites. These composites also showed improved electric conductivity froml5.1% to 43.7% and thermal conductivity from 12 % to 31.3%.